Four people were arrested and a man was transported to a Portland hospital after a fight over a custody issue broke out at a Cornelius residence Monday night, according to the Cornelius Police Department.

About 10:20 p.m., Cornelius and Forest Grove officers responded to a report of a fight at the home, in the 900 block of South Ginger Street, said Cornelius Sgt. Shawn Watts, in a news release. Police arrived and reportedly found several people in the front yard of the residence and two men fighting. One of the men, Watts said, was armed with a short metal club.

Officers broke up the fight, Watts said, and, through their investigation, learned that the fight was about custody of a 2-year-old child. The child's mother, Watts said, reportedly took the child from the father's home in Clackamas County.

In the Monday night incident, the father, Watts said, barged into the Cornelius residence, where the mother lives with his parents. The father said he was there to get the child, Watts said, and he brought friends along to help him.

A fight then broke out and one man, who was not identified, was struck in the head with the metal club, Watts said. The man reportedly was transported by ambulance to OHSU Hospital in Portland with injuries described as not life-threatening. His current condition is unknown.

During the fight, the child was taken from the home, Watts said, but was later returned to police and then to her mother.

The child's father, whom police identified as Kyle Andrew Bush, 22, was arrested on accusations of first-degree burglary, harassment and interfering with police, Watts said. He was lodged in the Washington County Jail.

Justin Dallas Emra, 26, was arrested on accusations of first-degree assault, first-degree burglary and unlawful use of a weapon, and lodged in jail, Watts said. First-degree assault is a Measure 11 crime that carries a mandatory minimum sentence of more than seven years in prison.

Police also arrested Jonathen Robert Eggleston, 27, and Jennifer Jan Emra, 19, on first-degree burglary and fourth-degree assault charges, Watts said. Eggleston also reportedly was arrested on a charge of interfering with police. Both were lodged in jail.